Yes - Right click in the drawing and select "Edit Sheet" delete/add anything you want..
First of all, not to be the grammar police, but there's no such thing as a sheet template (see What's the difference between a sheet format and drawing template?).
Now, when you say you want to delete the fields, do you mean the blank boxes that don't have any text? If yes, then those are likely just created with sketch lines. You should be able to select and delete them while in "Edit sheet format" mode. Don't forget to save your sheet format after doing that.